<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <script>
        var a = 10;
        var b = "Hello";
        var c = 5;
        console.log(a + b);
        console.log(a + b + c);
        console.log(b + a + c);  //字符串+ 算数运算 + 级别是同等的
        console.log(b + (a + c));
        console.log(b + a / c);  // / 优先级高于 +
        console.log(b + a % c);  // % 优先级高于 +
        console.log(b + (a > c));
        console.log(b + (a < c));
    </script>
</body>
</html>